Abstract: A cassette type magnetic bubble memory comprise a bubble memory device including a bubble memory chip and lead terminals; a connector having contacts for electrically connecting the bubble memory device to an outside unit; thin flexible printed substrates for electrically connecting the contacts of the connector to the lead terminals of the bubble memory device; and a cassette case for accommodating therein the bubble memory device, the connector, and the printed substrates. The cassette case has inner walls. Some parts of the inner walls are in contact with at least some parts of an outer face of the bubble memory device to retain the device in the cassette case so that the majority of the outer face of the device is spaced from the majority of the inner walls of the cassette case. The bubble memory device and the connector are arranged in displaced positions along a plane common to the longitudinal direction of insertion of the cassette case into a bubble memory control unit.